This is the first book I‘ve read on pendulums. The first half of the book introduces the reader to pendulums, offering information on how to select a pendulum, how to begin working with one, that sort of thing. The author suggests using charts to help with answering questions, and the second half of the book is a series of charts for almost any question you can think of. While I haven‘t worked through the exercises yet, this looks solid. ⭐️⭐️⭐️⭐️!